One Rep Max Tracker 💪📈

A web app that helps users track their strength progress by calculating and visualizing their One Rep Max (1RM) over time for any exercise.

🧠 What It Does

This app allows users to:

• Input an exercise, weight lifted, and number of reps performed
• Automatically calculate the One Rep Max (1RM) using the Epley formula
• Store and view 1RM entries over time
• See a graphical representation of their strength progression for each exercise

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📊 One Rep Max Formula

We use the Epley formula to estimate 1RM:

Example:
If a user lifts 225 lbs for 5 reps: 255 lbs

Then: Uses linear regression to calculate the progress over 50 days. Although inaccurate initially, the projection gets better over time

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🖼️ Features

• 🔐 Optional user login for personalized tracking (if using auth)
• 🏋️ Add any custom exercise
• 📈 View 1RM history in a responsive line graph (Recharts)
• ☁️ Data persistence with a backend (Postgresql, Express.js)

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🛠️ Tech Stack

• Frontend: React,
• Backend: Node.js, Express.js
• Database: Postgresql
• Graphing Library: Recharts.js
• Deployment: Cloudflare, Vercel, Supabase
• Security and Authenticaion: JsonWebToken

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🚀 Getting Started

Prerequisites

• Node.js & npm installed
• Postgresql and the Strength-Projector-API (also in my github repositories)

Installation

git clone https://github.com/A-Galicia/Strength-Projector.git cd Strength-Projector npm install npm run dev